/**
 * A StudentCardFactory is a CardFactory that creates cards for a
 * student.
 **/

public class StudentCardFactory extends CardFactory {

  private static final int CARD_COST = 25;
  
  protected static StudentCardFactory cardFactory =
    new StudentCardFactory();
  
  private StudentCardFactory() {    
    //suppress default no-arg constructor
  }

  /**
   * @return an instance of CardFactory.  this class cannot be
   * instantiated directly; instances can ONLY be acquired through
   * this method.
   */
  public StudentCardFactory getInstance() {
    return this.cardFactory;
  }

  /**
   * A factory method to produce a new card.
   *
   * @throws NotAStudentException if name and idNumber do not
   *    refer to a student
   * @return a new Card for the person with name 'name' and id number
   *    'idNumber', that gives access to the buildings in privileges.
   *    The card is a student card -- the background is purple, and
   *    "Student" is printed on the card.
   **/
  public Card createCard(String name,
			 String idNumber) throws NotAStudentException {
    
    BuildingID dorm = null;
    try {
      dorm = CardOffice.getDorm(idNumber);
    }
    catch (NotAStudentException e) {
      throw e;
    }
    List accessPrivileges =  new ArrayList();
    if (dorm != null) {
      AccessPrivilege dormPriv =
	CardOffice.getBuildingAccess(idNumber,
				     dorm);
      accessPrivileges.add(dormPriv);
    }
    
    chargeBursar(CARD_COST);      
    return new Card(name, idNumber,
		    CARD_COLOR, "Student",
		    accessPrivileges);
  }
}